[zfs-discuss] Cheap arm64 development board

Gordan Bobic gordan.bobic at gmail.com
Wed Dec 28 07:35:41 EST 2016


On Wed, Dec 28, 2016 at 12:32 PM, Durval Menezes <durval.menezes at gmail.com>
wrote:

> Hi Gordan,
>
> On Wed, Dec 28, 2016 at 10:11 AM, Gordan Bobic via zfs-discuss <
> zfs-discuss at list.zfsonlinux.org> wrote:
>
>> Yes, ECC memory will cost 25% more, there's no way around that as it
>> requires 10 bits of memory for every 8 bits of data.
>>
>
> Err, isn't it 9 bits of memory for every 8 bits of data? After all, the
> ECC DDRx DIMMs  are 72 bits wide, instead of 64 bits for the non-ECC... and
> 72/8= 9...
>
> So the real overprice should be in the 12.5% range (ie, 10-15% as I
> mentioned previously), not 25%...
>

You may be right on that. I know parity RAM of old was 9 bits/byte, but I
could have sworn that ECC DIMMs come with mod(10) number of chips while
non-ECC DIMMs come with mod(8) number of chips on them.
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